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ZF 6 speed
Elder User
Joined: Nov 2004
Posts: 829
Likes: 0
From: Syracuse, NY
It's not that hard. it just costs money. drop the tail of the zf6 down a hair. maybe push up on the tunnel a hair. it will clear.
The output on the 6 is bigger than the e4od, 4r100 and zf5. So not all SD cases will work. Has to be one from a 6 speed SD. This is 7.3 trucks. IDK about 6.0s or what the output is on 5r110s
The output on the 6 is bigger than the e4od, 4r100 and zf5. So not all SD cases will work. Has to be one from a 6 speed SD. This is 7.3 trucks. IDK about 6.0s or what the output is on 5r110s
Thread Starter
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Senior User
Joined: Sep 2012
Posts: 207
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The ZF5 and ZF6 output shafts are different, so you need the SD tcase, which I believe has different yokes so now you need custom drive shafts too. That's a lot of work for a .71:1 difference, or a .07:1 difference if you do a gas/diesel hybrid.
In the end, your towing capabilities will be much better off with a gear swap to 4.10s or at least 3.73s.
In the end, your towing capabilities will be much better off with a gear swap to 4.10s or at least 3.73s.
The 5.76 first gear is what I'm after, the 4.14 and 3.55's sux........
And a 5 mph higher speed in overdrive at 2000 rpm will be nice too ! ! !
Also I have twice, towing heavy in overdrive, had the ZF5 get hot and not want to shift when I got off the interstate.
More Turbo
Joined: May 2012
Posts: 542
Likes: 1
From: New Milford, CT
I'm just saying that the ZF6 swap requires so much more work and $$ than just swapping your S42 for a S47, or putting 460 gears in your S42 case.
One thing I also haven't seen mentioned yet is that the ZF6 physically will not fit in an OBS without modifying the trans tunnel. So add that to needing a new tcase and drivelines.
One thing I also haven't seen mentioned yet is that the ZF6 physically will not fit in an OBS without modifying the trans tunnel. So add that to needing a new tcase and drivelines.
Don't take my word for it though, do some googling if that becomes the deciding factor.
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Senior User
Joined: Sep 2012
Posts: 207
Likes: 0
I thought I read that with the manual shift tunnel cover it would fit, just the automatic tunnel wouldn't clear.
I had rather not do a cab lift.
May have to do some precision BFH mods to the floor.
I had rather not do a cab lift.
May have to do some precision BFH mods to the floor.
More Turbo
Joined: May 2012
Posts: 542
Likes: 1
From: New Milford, CT
I have no doubts that with a big enough hammer you'll be able to clear a ZF6.
You just can't do a writeup on something and have step 14 be "Beat trans tunnel with massive hammer until trans fit" as some people aren't into the BFH life.
You just can't do a writeup on something and have step 14 be "Beat trans tunnel with massive hammer until trans fit" as some people aren't into the BFH life.
Elder User
Joined: Nov 2004
Posts: 829
Likes: 0
From: Syracuse, NY
BFH life haha.
dropping the tail down should get it close to where it just touches, or rubs, and just push up on the floor with a jack or something to make it clear. shouldn't need a BFH, and it just a little bit, nothing that should be noticeable looking at from inside or underneath. I forget for sure though what was done one my buddy's truck we put a zf6 in.
dropping the tail down should get it close to where it just touches, or rubs, and just push up on the floor with a jack or something to make it clear. shouldn't need a BFH, and it just a little bit, nothing that should be noticeable looking at from inside or underneath. I forget for sure though what was done one my buddy's truck we put a zf6 in.
Lead Driver
Joined: Oct 2003
Posts: 8,476
Likes: 37
From: Madison, WI
Anyone doing DIY at this level should be willing to use the BFH when appropriate.
Dropping the tail would change the driveline angle, no? So you'd want to adjust the angle at the diff to match?
Dropping the tail would change the driveline angle, no? So you'd want to adjust the angle at the diff to match?
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Fleet Mechanic
Joined: Nov 2006
Posts: 1,952
Likes: 1
From: Knoxville, TN
Doesn't this change the angles of all the oil pick-ups too (engine, tranny, etc)? ...along with the drain back ports...
That would bother me....
Elder User
Joined: Nov 2004
Posts: 829
Likes: 0
From: Syracuse, NY
I suppose it would a slight amount. if it was an issue, putting different pitched wedges on the rear axle could re align the drive line angles. but depending on the truck configuration, it probably wont matter. everything other than a rclb has 2 piece shaft, don't they?
The pick ups should be covered in oil even at extreme angles, a few degrees shouldn't matter. Plus this is only the case when on level ground. Hills, loaded bed, or trailer, plow, lift kits, worn out springs would all affect how the engine sits. I think it will be fine
The pick ups should be covered in oil even at extreme angles, a few degrees shouldn't matter. Plus this is only the case when on level ground. Hills, loaded bed, or trailer, plow, lift kits, worn out springs would all affect how the engine sits. I think it will be fine
Lead Driver
Joined: Oct 2003
Posts: 8,476
Likes: 37
From: Madison, WI
AFAIK all SC and CC trucks have two-piece rear driveshafts. But that has no bearing (no pun intended...) on the driveline angles. The output of the t-case and the input of the diff should be parallel.
More Turbo
Joined: May 2012
Posts: 542
Likes: 1
From: New Milford, CT
As far as driveshaft lengths are concerned it's totally possible to cut and shorten a driveshaft yourself if you have a welder and a dial indicator.
I've had pretty good success shortening driveshafts and then using a dial indicator to get it true and then slowly working my way around it tacking it and checking it up to make sure it holds true.
Probably done four or so that way and never once have had any vibration issues.
I've had pretty good success shortening driveshafts and then using a dial indicator to get it true and then slowly working my way around it tacking it and checking it up to make sure it holds true.
Probably done four or so that way and never once have had any vibration issues.
PREMIUM SPONSOR
Joined: Sep 2003
Posts: 2,630
Likes: 217
From: North East Ohio
7.3 6 speed trans are very rare to say the least.
If you are doing the swap, you'll also need a 7.3 ZF 6 speed t-case, not just ANY Super Duty 6 speed t-case, but a 7.3 6 speed t-case. The 6.0 6 speed trans and t-cases are different and won't just swap in place.
I like Bill's option the best, a Hybrid gets the best all around gearing. The only positive thing about doing a 6 speed swap in an OBS, if there is one, is to brag that you did the swap. I can't see any other reason to do it.
If you are doing the swap, you'll also need a 7.3 ZF 6 speed t-case, not just ANY Super Duty 6 speed t-case, but a 7.3 6 speed t-case. The 6.0 6 speed trans and t-cases are different and won't just swap in place.
I like Bill's option the best, a Hybrid gets the best all around gearing. The only positive thing about doing a 6 speed swap in an OBS, if there is one, is to brag that you did the swap. I can't see any other reason to do it.
__________________
'96 7.3 F-350 Reg Cab 4x4 - bought new.
'04 6.0 E-350 custom 4x4
'08 6.4 F-550 Reg Cab 6 spd 4x4
'17 6.7 F-250 KR ccsb 4x4
'96 7.3 F-350 Reg Cab 4x4 - bought new.
'04 6.0 E-350 custom 4x4
'08 6.4 F-550 Reg Cab 6 spd 4x4
'17 6.7 F-250 KR ccsb 4x4
Elder User
Joined: Nov 2004
Posts: 829
Likes: 0
From: Syracuse, NY
I wont have any more into the swap in my F-sd than what some ppl have in a zf5 swap. not a big deal there. The the gain of an extra gear is nice, I honestly cant stand my zf5 in my 350, but i recently sold a 460 zf to someone to turn their 7.3 zf to a 4x4, I drove that truck and it was a lot nicer than mine. Reverse is up and to the left, nice for going back and forth. I have the 05+ axles, might as well go zf6. already need custom shafts anyways. Just something I wanted to do, a project iv been accumulating parts for over a few years.
What is difference about 6.0 zf6 t cases, if you know? and what about zf6 t cases off later gas trucks? same as the 6.0 ones?
What is difference about 6.0 zf6 t cases, if you know? and what about zf6 t cases off later gas trucks? same as the 6.0 ones?
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Joined: Sep 2003
Posts: 2,630
Likes: 217
From: North East Ohio
No idea on gas truck stuff, not a clue at all.
The 7.3 and 6.0 t-cases have different inputs, and the 6 spd and auto trans t-cases have different inputs again.
So you have to match standard vs auto trans, and 7.3 vs 6.0 engine to get the correct t-case.
The 7.3 and 6.0 t-cases have different inputs, and the 6 spd and auto trans t-cases have different inputs again.
So you have to match standard vs auto trans, and 7.3 vs 6.0 engine to get the correct t-case.
__________________
'96 7.3 F-350 Reg Cab 4x4 - bought new.
'04 6.0 E-350 custom 4x4
'08 6.4 F-550 Reg Cab 6 spd 4x4
'17 6.7 F-250 KR ccsb 4x4
'96 7.3 F-350 Reg Cab 4x4 - bought new.
'04 6.0 E-350 custom 4x4
'08 6.4 F-550 Reg Cab 6 spd 4x4
'17 6.7 F-250 KR ccsb 4x4